Phase-Interference Digital Filter for Stable Signal Emphasis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
State-variable multimode digital filters with non-linear circuits exhibit poor emphasizing behaviors, such as amplifying or sharpening input signals, leading to unstable operations.
Innovation Solution
A digital filter circuit with a short-term and long-term storage unit influences two phases, where outputs from each phase generate interference due to a phase shift, using a first phase synthesizer and a second phase synthesizer, simulating biological neural circuits to achieve desirable signal amplification or emphasis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-linear circuit is inserted in an accumulator to restrict oscillation level, then stability of operation is improved, but emphasizing behavior (amplification or sharpening of input signal) deteriorates
Solution Approach 1:
The filter is divided into multiple integrators (first integrator 11, second integrator 12, third integrator 13) that operate in different phases. Each integrator contributes to different aspects of signal processing, allowing the system to achieve both stability through controlled oscillation and emphasizing behavior through phase-dependent signal combination.
Solution Approach 2:
The circuit employs periodic phase switching between different operational modes. The phase switching unit alternates between first phase and second phase, enabling the system to accumulate signal energy during one phase and release it during another, thereby achieving both stable operation and signal emphasis.
2Reliability
If a non-linear conversion unit is inserted into a feedback loop to generate distortion components, then sound quality is improved, but control over signal amplification and sharpening deteriorates
Solution Approach 1:
The circuit changes parameters dynamically through phase switching. During the first phase, the system accumulates energy with specific parameter settings, while during the second phase, different parameters are activated to release energy in a controlled manner, enabling both high sound quality and controllable amplification.
Solution Approach 2:
The feedback loop incorporates non-linear conversion units that generate distortion components beneficial for sound quality. The feedback mechanism is controlled through phase switching, allowing the system to maintain stable oscillation while preserving the ability to amplify and sharpen signals through controlled feedback activation.
Data Source
AI summary
A digital filter circuit includes retrieve stream data as a digital signal, and cyclically operate a first phase and a second phase. The circuit includes a short-term storage unit configured to store a local state variable, a long-term storage unit configured to store a global state variable, a first phase synthesizing unit that outputs the digital signal in the first phase under an influence of the local state variable stored in the short-term storage unit, and a second phase synthesizing unit that outputs the digital signal in the second phase under an influence of the global state variable stored in the long-term storage unit, where an output from the first phase synthesizing unit and an output from the second phase synthesizing unit are caused to generate an interference due to a phase shift.